Its developed a leak through where the rear prop goes to the box, now owning a landrover my self i would assume that behind where the prop meets there would be a flange with a seal behind. Can anyone ellaborate on whats behind and what parts i may need to cure the problem for him.

It does clonk on take up which would suggest the flange needs replacing inside too as the prop is all ok ( and what a long prop it is lol )

Check the rear diff for a leak aswell... it could be the start of something else? - viscous/ird wear issues?I started a few weeks ago with a leak from prop entrance into the transfer box and ignored it for a while!! Ended up the viscous had gone + was slowly taking the ird apart..... eventualy culminated in the viscous barings giving way (clonking noises) then blowing apart on my way to get replacement parts.... Messy! Good luck! So far mine's costing mega money to put right!!Fingers crossed its not the same thing!

you CAN buy the ird parts as required off ebay (barings/seals etc) and the likes, personaly... that wasnt the way to go as the ird was getting noisy anyway. Has the car got noisier recently? mine was particularly bad when driving slowly.... The main expense with the ird is the crown wheel + pinion, if they've gone, its just as easy + cheap to get a recon unit rather than try fixing it!!Im not saying its deffinately the same problem... be worth getting it checked over sooner rather than later..... Dont forget to check the barings either side of the viscous unit aswell, they must have been in terrible condition thenb blew apart on mine, which finished the ird off!